I'd like to ask why, since these things hardly every fail. But you sound like you know what you are doing, so ...
You can buy one at any hardware store, for about $5-$8. Nothing special or fancy. There are a couple mounting "styles" that look very similar to each other, so take a look at the existing breakers in the TM, pick off a manufacturer name (Siemens, Arrow-Hart, GTE, Square-D, Cutler-Hammer, etc), then buy one that is listed as "compatible" (doesn't have to be the same exact manufacturer).
Bill
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